Ben, try ordering the tamiya from megahobby.com. I've always used them for my paint purchases and have never had a problem. though if the problem is with tamiya themselves, then noone will be able to help.
The problem may also explain why I've been having a problem finding tamiya cement (in the bottle with the orange cap).
Bill, the headaches may also be being caused by a sudden drop in blood pressure to the ol' noggin', if ya catch my drift
-Fred